Superfluous to risky: nutritional supplements fail at Stiftung Warentest. The cost of a daily dose of these products varies significantly, ranging from 14 cents to 2.18 euros.
No conclusive evidence for any of the products examined that it relieves joint pain or prevents the development of osteoarthritis. There are concerns that high doses of vitamin E may increase the risk of prostate cancer in men over 55 years of age. Illegal advertising promises were also found on the packaging of some products.